bartoszpogoda / computer-architecture-asm

My assembly language programs for Computer Architecture 2 course

Computer Architecture II - Assembly Programs

My assembly language programs for Computer Architecture 2 course

Lab classes 1

A program that reads byte input of not specified size and processes it

Details:

Processing: if read byte is within 'A' - 'Z' ascii range then it should be cesar-shifted with some predefined shift value and then redirected to standard output, otherwise just redirected to standard output

Lab classes 2

A program that sums, substracts and multiplies two n-byte size operands

Details:

Input format: [n][ numberA ][ numberB ]

Where:

• n - 1-byte operands size (0-255 range)
• numberA - n-byte NB number
• numberB - n-byte NB number
• LSB is to the left, MSB to the right

Output format: [n][ sum ][ difference ][ B>A flag ][ product ]

Where:

• n - 1-byte operands size
• sum - n+1-byte size addition result
• difference - n-byte size numberA-numberB substraction result
• followed by 1-byte B>A flag which indicates incorrect result
• product - 2n-byte size numberA*numberB multiplication result
• LSB is to the left, MSB to the right

Lab classes 3

C and assembly cross-language programs - working with Application Binary Interface.

Task 1

An assembly program that uses C functions - scanf and printf. Scanf and printf are tested for 3 types of arguments - number, character and string.

Details:

• function is main to make it GCC compatible
• it follows ABI rules
• gcc includes needed libraries on its own

Task 2

A C program that calls function defined in assembly. The assembly function returns processor's TSC (Time Stamp Counter) value.

Details:

• the cpuid instruction before TSC read is to guarantee that the processor will finish all instructions being executed
• according to ABI, 64-bit values can be returned in [%edx,%eax] set of 32-bit registers.

Task 3

Cross-language variable (memory) access.

Details:

1. define memory block in assembly and then use it in C
2. define variable in C and then use it in assemly

Task 4

Time measurments for write, printf C-functions using function implemented in Task 2. Also measurments of MOV memory operation time.

Details:

• times are given in processor cycles

Lab classes 4

FPU (Floating Point Unit)

Task 1

Set of functions to operate on control and status registers.

Task 2

Force two FPU exceptions and prove their occurence (show status register)

Task 3

Change the precision of the FPU operations and prove it has changed.

Task 4

Change rounding mode of the FPU operations and prove it has changed.

Lab classes 5

Some fun with MMX

Task

Given a C programm that loads, prints the image implement a filter function that will perform pixel operations (with minimal loss of information). p(i) = p(i) + p(i + T)*alpha where p(i) is a pixel on i'th position, i is in [0,width*height] range, T is some chosen translation value and alpha is chosen constant in (0,1) range.

Parameters should be picked to make translation as easy to compute on MMX as possible. (MMX doesn't support division)

Filter function should be implemented both in C and in assembly language - using MMX instruction set support - (SIMD single instrunction multiple data). Time results for functions described above should be then compared.

Lab classes 6

Cache

Task 1

Show that cache memory is built of lines of fixed width.

Task 2

Analyse how size of memory block affects the cache's miss ratio on some operation.

Task 3

Compare times of 2d matrix iterations: row after row, column after column. (Matrix should be bigger than cache memory)